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1
Directory of the mineral industry in Pennsylvania.
Harrisburg : Pennsylvania Geological Survey, 1965

Serial
2
Directory of the nonfuel-mineral producers in Pennsylvania.
Harrisburg : Pennsylvania Geological Survey, 1985

Government Document Serial
3
Directory of the nonfuel-mineral producers in Pennsylvania /
by Berkheiser, Samuel W.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1985
4th ed.

Government Document Book
4
Directory of the mineral industry in Pennsylvania /
by O'Neill, Bernard J., 1920-
Harrisburg : Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey, 1965

Book
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